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Signal digitizers revolutionized the approach to the electronics readout ofradiation detectors in Nuclear Physics. These highly specialized pieces ofequipment are designed to acquire the signals that are characteristic of thedetectors in nuclear physics experiments. The functions of the several modulesthat were once needed for signal acquisition, can now be substituted by asingle digitizer. As suggested by the name, with such readout modules, signalsare first digitized (i.e. the signal waveform is sampled and converted to adigital representation) and then either stored or analyzed on-the-fly. Theperformances can be comparable or better than the traditional analogcounterparts, in terms of energy, time resolution, and acquisition rate.  In this work, we investigate the use of general-purpose digital oscilloscopesas signal digitizers for nuclear detectors. In order to have a propercomparison, we employ a distributed data acquisition system (DAQ), thatstandardizes the interface between the hardware and the on-line data analysis.The signals, from a set of typical radiation detectors, are digitized andanalyzed with the very same algorithms in order to avoid biases due todifferent software analysis. We compare two traditional signal digitizers (CAENDT5725 and CAEN DT5751) to two low-cost digital oscilloscopes (Digilent AnalogDiscovery 2, and Red Pitaya STEMLab 125-14), in terms of their capabilities forspectroscopy (energy resolution), time resolution, pulse shape discrimination,and maximum acquisition rate.

journal of instrumentation

Performance comparison between signal digitizers and low-cost digital  oscilloscopes: spectroscopic, pulse shape discrimination and timing  capabilities for nuclear detectors